Dimension indicating gauge



Feb. 11, 1947. HABUDA 2,415,741

DIMENSION INDICATING GAUGE I Filed Sept. 10, 1943 2 Sheets-Sheet 1 Feb. 11, 1947. HABUDA' 2,415,741

DIMENSION INDICATING GAUGE Filed Sept. 10, 1943 2 Sheets-Sheet 2 25 24-5 3 54 42 4 17 15 a so 34 i6 y 45/ I2 9 u I Patented Feb. 11, 1947 ZAlSJiii FFECE DIMENSION INDICATING GAUGE Martin Habuda, St. Catharines, @ntario, Canada Application September 10, 1943, Serial No. 501,797 In Canada September 12, 1942 1 Claim. 1

Thi invention relates to improvements in indicaters adaptedto the purpose of gauging and testing the accuracy of surfaces and of machine work generally, and is particularly adapted for the purpose of gauging and indicating the accuracy of internal surfaces such, for instance, as are produced by jig boring machine and jig grinders.

The primary object of the invention is to provide a gauge indicator of accurate quality adapted to indicate the presence of inaccuracies or error in machine work and capable of being adjusted without the use of further or additional adapters to cover a wide range of accurate measurement in the type of machine work above mentioned.

A further object of the invention is to provide accurate gauge for locating the spacings and points of measurement for work to be performed by machines such as jig boring machines and jig grinders.

further object of the invention is to permit the accurate gauging of small or large apert... without assistance from any other gauging device or adapter.

Other objects of my invention will become evident from the following detailed description taken conjunction with the accompanying drawings in which 1 is a top plan View of the indicator embodying the invention.

Fig. 2 a side elevation thereof.

Fig. 3 is a bottom plan view showing the adjustable holding member.

Fig. 3a is plan View of the contact point.

4 i s a longitudinal cross section view taken or the line C- of Fig. 1. looking in the direction of the arrows illustrating in detail the construction of the indicator.

Fig. 5 is a longitudinal cross section view taken at right angles to Fig. 4.

6 is a transverse cross sectional view taken on the line 6-45 of Fig. 2, looking in the direction of the arrows.

Fig. 'l is a top plan view of the reversing spring and the ring holder therefor.

rig. 8 is a side elevation View of the spring and ring holder.

Like characters of reference in the drawings indicate like parts.

E indicate an indicator having an elongated casing portion 2, tapering to an open end 3, provided on the opposite end with a circular casing housing 4, provided with a bottom wall 5 as shown in Fig. 3.

The open end of the elongated housing 2 is provided with ear 6 and I, having apertures for receiving adjustable centre screws 8 and 9 respectively, the inner ends of which are pointed to form pivot bearings entering a bushing I0, having opposite ends countersunk to conform to the pointed portion of the centre screws 8 and 9. Frictionally mounted on the bushing ii) is one end l2 of a sector arm H.

Frictionally fitted on the bushing i0 is a movable and adjustable contact arm l3 having a bifurcated portion adapted to straddle the end E2 of the sector arm H. The free end of the contact arm !3 terminates in a point and may be threaded as shown at I4 to receive a spherical contact member l5 which may be varied as to size and shape. It is obvious that the threading id may be omitted and that the member l5 may be of a suitable shape to enable it to be slipped over the free end of the contact arm l3 and be held there by friction.

An opposed adjustable holder member I5 is mounted on the opposite end of the indicator l and is rotatably carried by a boss ill formed on the free end of an extension arm [8. The rotatably adjustable holder it has an eccentric-end portion set in the boss IT at a slight eccentricity to an extent which may be desired, but which in practice I have found to be suitable if set at .005. The purpose of this eccentric setting will be more particularly explained hereafter.

The inner end of the extension arm is is provided with a bearing portion I9 split as at 28 so that the bearing portion will frictionally engage a, rounded boss 2! centrally located with respect to the bottom wall 5 of the casing d. The adjustable holder member it may be swung to the right or left of the pivot 2| about the circular casing t to adjust the contact for various uses.

A circular indicator casing 22 is rotatably mounted with respect to the circular housing t and is provided with an annular flange 23 upon which is adapted to rest the annular plate 24 having oifset portions 25 terminating in foot portions 25 adapted to be secured to the bosses 24a by machine screws 21, extending through open- 28, formed in the offset portions 25, so that the screw threaded ends 29 may be received in correspondingly threaded openings formed in the bosses 24a.

The circular indicator casing 22 is provided with a bevel flange 3!) for receiving the bevelled edge 35 of an unbreakable crystal 32. A graduated dial 33 is supported in the annular casing 22 and is held in place by means of .a split rin 34 snapped into engagement in an annular recess formed internally in the circular indicator casing 22. interposed between the flanges 24 and the flanges 23 of the casing is a flat circular Spring 36 which causes the circular indicator casing to be drawn downward upon the circular casing 4 in a frictional manner. The circular indicator casing 22 may be rotated by engaging the knurled portion 37 thereof and turning the indicator casing on the flanges 2 The central portion of the annular plate 24 is countersunk as shown at 24?) and within the aperture thus formed and surrounding the pinion shaft 38 is placed a hair spring M which operates the return of the pinion shaft 33 to its central position when the contact arm i3 is moved in one direction and at the same time tends to eliminate any bacl; lash between the meshes of the gears formed by pinion 35 and gears 45 of sector arm I i when operated in the opposite direction.

The vertical pinion shaft 38 has its lower end 33 received in an opening 48 located centrally with respect to the rounded boss or pivot 21 in the floor 5 of the casing 4 and the upper end of the pinion shaft 38 is provided with a collar 4! to which is attached a pointer 52 capable of registering with the graduations on the dial 353 as shown in Fig. l. The graduations is may be adapted to range from any given set of numbers from zero upward on either side of the dial as may be desired. In the illustration shown in Fig. 1 the graduations 43 range from to 20 on each side of the dial. The pointer 52 is capable of moving to the right or left to register with either set of graduations 43 and 44.

Also secured to the pinion shaft 38 is a pinion 45 adapted to mesh with a segment gear 46 formed on the inner end of the sector arm ll associated with the movable contact arm is. Oscillation of the arm H about its pivot bushing ill will cause the rotation of the pinion at in both directions so that the pointer 52 may move to the right or left over the graduations 43 and 24 in the same plane of movement as the arm ll.

Rotatably mounted within the said walls of the circular casing 4, is a flat ring ll having frictional contact engagement therewith and having one end bent inwardly as at 48 for being transversely bored as at B9 to receive the inner end of a reverse spring 58. The free end of the reverse spring 58 is bent as at and is adapted to rest against the sector arm I! for the purpose of reversing the indicator mechanism. A thumb piece 52 is provided at the diametricaliyopposite point of the ring Q1, and said thumb piece operates in an opening 53 formed in the vertical wall of, the circular casing 5.

The movable contact member l3 may be adjusted about the bushing H), to the right or left of the casing extension 2 as shown by the examples of the dotted positions in Fig. 1, and the adjustable holder 16 may be swung to a corresponding position about the pivot boss 2|. The

6 reverse spring 55 and the hair spring 55 will in all cases cause the indicator pointer to work from either direction desired and constitute the necessary resistance to the movement of the sector arm 5 I in order to ensure accurate gauging of the surfaces to be examined. The circular ring t! may be moved to throw the spring 56 off dead centre to the right or left and the indicator casing may be rotated to cause the dial and the graduations thereon to be clearly visible from the posi- 5 tion occupied by the operator.

In operation the adjustable holder is rigidly secured in the collet or chuck of the machine spindle and the work to be gauged is moved and placed in position under the contact point I3. Upon 0 placing the free end [5 of the contact point l3 in contact with the work to be gauged any errors or inaccuracies are communicated by the sector arm H through the mechanism explained, to the pointer 42.

If the collet or chuck is out of correct alignment, the eccentric holder l B may be used to bring the contact point iii in central alignment with the axle of the spindle, thus enabling the contact point to be used in gauging very small apertures.

What I claim as my invention is:

In an indicator for measuring surfaces, aunitary casing comprising a dial housing, an extension therefrom having a forked extremity for pivotally mounting a contact member, a cylindrical boss on the dial housing, an arm in which said boss is frictionaily secured, an extension on said arm extending substantially at right angles to said arm and adjacent to said casing, and a holder rotatably and eccentricaliy cured in said extension and disposed substantially right angles thereto, for adjustably displacing said forked extremity with respect to axis of said holder member on rotation of said holder member.

MARTIN HABUDA.

REFERENCES CITED The following references of record in the file of this patent:

UNITED STATES PATENTS 

